You have an uncanny propensity to ignore repeated advice from those with more experience on said given subject.
Which is ultimately your prerogative, but will highly likely doom you to repeated failure after failure.
Example,
old_tv_nut is highly experienced in the TV field, and has been VERY involved with it's development since it's early days, he is a valuable source of knowledge for vintage TVs and the history there of.
Electronic M is also a very good source of TV restoration knowledge, he KNOWS what he is talking about, as does bandersen , dtvmcdonald, Username1.
I can go on and on.
The statement still apples .
“To repeat: you cannot conclude that there is a bad component somewhere until you do the alignment. Then if you still have trouble, you can conclude there is a bad component somewhere.” -old_tv_nut
Until this is done, you will forever go in circles chasing your tail.
The fact that you ever got color to work at all on it before, was simply wildest stroke of luck.
Things had to line up PERFECTLY for color to lock in, but due to the age of parts, and non alignment, factors like temperature, humidity, percentage of tube health and who knows how many other factors left you a VERY narrow window where it would work correctly.
Again, the correct alignment would have made this more stable.
And it's very unlikely by what you were describing that the old crystal was bad, the description of getting rainbow stripes sometimes , and other times, not is a symptom of a de-tuned circuit.
I gave you an example of what it looks like when the crystal is NOT working.
https://imgur.com/9HcgQcz
if it's running
https://imgur.com/m0IePGv
First
get the cores unstuck
Second, do the color AFC alignment.
THEN, if that fails
Third
look for the fault.
But it's your set, you can do what you want.